The mapping handling needs a big refactor for powermax as it is currently very easy to fail. The current code tries to locate free ports on the array. that is fragile. and the masking view creation is buggy.
Instead:
- pass in the port group the system uses. The admin should know. Pass it as part of the secret POWERMAX_PORT_GROUP_NAME
- create unique storage group name (with some random id)
- create unique masking view
- attach the host and not a group to the masking view

Always

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